Air brake bushing grinder



July 9, 1935..

A. C. BRIGNONI AIR BRAKE BUSHING GRINDER Filed Aug. 14, 1.954

- ATTORNEYS Patented July 9, 1935 UNITED STATES PATENT OFFICE AIR BRAKE BUSHING GRINDER Albert C. Brignoni, New Orleans, La., assignor of one-half to J. B. Craft, New Orleans, La.

Application August 14, 1934, Serial No. 739,797

2 Claims.

p vice which may be easily actuated on the walls of a bushing and adjusted to bring about a desired pressure on said wall during the grinding thereof and may be employedwith the greatest degree of accuracy and is so constructed that the abrasive material thereof may be easily and quickly changed for other abrasive material when worn. I

With these and other objects in View this invention consists in certain novel features of construction, combination and arrangement of parts to be hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawing, in which Figure l is asideelevation illustrating a grinder constructed in accordance with my invention.

Figure 2 is a vertical sectional view illustrating the same.

Figure 3 is a sectional view taken on the line 33 of Figure 2. I

Figure; is a similar view taken on the line 4-4 of Figure 2. v

Figure 5 is a perspective view illustrating one of the sections of the abrasive supporting medium.

Figure 6 is a perspective View illustrating an abrasive securing strip.

Referring in detail to the drawing, the numeral l indicates a hub having a centrally arranged bore 2 and of substantially rectangular shape in cross section and has integral with one end an internally screw threaded neck 3 communicative with the bore. A screw threaded adjusting stem 4 is threaded into the neck and providedwith a tapered portion fioperating in the bore 2. The stem 4 is equipped with a head 6 carrying a handle or finger piece 1 to facilitate the rotation of the stem in either direction for the purpose of moving the reduced portion 5 inwardly and outwardly with respect to the bore. Surrounding the hub I is an abrasive supporting element 8 of cylindrical shape and including semi-cylindrical sections 9 provided at one end with notches I0 to receive guide pins I I carried by the neck 3.

50 The sections 9 are recessed todefine spaced shoulders l2 adapted to overlie opposite ends of the the hub and slidably secured to said sections,

hub, as shown in Figure 2. Thesections 9 are engaged upon their inner faces by slidably'mounted pins 23, the latter being mounted in openings formed in the hub l and communicative with the bore 2 so that the tapered end 5 of the stem 4 5 may ride against the'inner ends of the pin.

Abrasive material [4 in-sheet form is placed in engagement with the outer faces of the sections 9 and has opposite ends thereof bent to extend into grooves l5 and are retained in said grooves 10 by wedging strips "5 which may be readily moved out of said grooves when desiring to free the abrasive material from said sections. A device of the character described may be readily placed Within a bushing and adjusted to 15 the walls of said bushing so that on manual movement of the device relative to the bushing the walls of the latter may be accurately and conveniently ground.

Having described the invention, I claim:

1. A grinder comprising a hub having a centrally arranged bore, a neck integral with one end of said hub and in alignment with the bore and internally screw threaded, a screw threaded stem threaded in the neck and having a tapered portion operating in the bore, a handle for said stem, semicylindrical sections surrounding the hub and each recessed to form flanges for overlying the ends of the hub, drive pins secured to abrasive material removably secured to the outer faces of said sections, and means between the sections and the tapered end of the stem for adjus'ting the sections relative to the hub.

2. A grinder comprising a hub having a centrally arranged bore, a neck integral with one end of said hub and in alignment with the bore and internally screw threaded, a screw threaded stern threaded in the neck and having a tapered portion operating in the bore,- a handle for said stem, semicylindrical sections surrounding the hub and each recessed to form flanges for overlying the ends of the hub, drive pins secured to the hub and slidably connected to said sections, abrasive material removably secured to the outer faces of said sections, and pins slidably mounted to the hub and engaging said sections and the tapered end of the stem to force the sections outwardly from the hub.

ALBERT C. BRIGNONI. 

